Wireman Semester 4 Module 2 - Generation and transmission

Wireman – Semester 4 Module 2 - Generation and transmission Reviewed and updated on: 01st November 2019 Version 1.1

1 : Which principle the transformer works? A : Self induction B : Mutual induction C : Fall of potential D : Lenzs law

2 : Which is the colour of fresh silica gel? A : Green B : Blue C : Grey D : Yellow

3 : Which part act as protective device in transformer? A : Conservator tank B : Tap changer C : Temperature gauge D : Buchholz relay

4 : Which part reduces the heat of transformer core and winding? A : Transformer oil B : Breather C : Cooling tubes D : Conservator tank

5 : What is the name of transformer?

A : Audio frequency transformer B : High frequency transformer C : Poly phase transformer D : Current transformer

6 : Which transformer, the secondary voltage is same as that of primary voltage? A : Ignition transformer B : Pulse transformer C : Isolation transformer D : Instrument transformer

7 : What is the name of transformer?

A : Ring type transformer B : Core type transformer C : Current transformer D : Air core transformer

8 : What is the emf equation of transformer? A :

B :

C :

D :

9 : Which is denoted by the letter qm in the formula 4.44 FNqm ? A : Maximum flux B : No of turns in primary C : No of turns in secondary D : Frequency

10 : What is the name of transformer if the transformation ratio (K) is more than 1? A : Step down transformer B : Unity ratio transformer C : Step up transformer D : Auto transformer


11 : Which is the transformation ratio? A :

B :

C :

D :

12 : What is the name of transformer part?

A : ON load tap changer B : H.V. Bushing termination C : Manual tap changer D : L.V. Bushing termination

13 : Which factor the copper loss of a transformer depends? A : Current B : Voltage C : Square of current D : Square of voltage

14 : Which is having high efficiency? A : Transformer B : Alternator

C : AC motor D : DC motor

15 : Which formula is used to calculate the efficiency of transformer? A :

B :

C :

D :

16 : Which is the formula for percentage voltage regulation? A :

B :

C :

D :

17 : Which material is used for transformer bushings? A : PVC B : Porcelain C : Plastic D : Baklite


18 : Which principle auto transformer works? A : Lenzs law B : Flemings right hand rule C : Self induction D : Mutual induction

19 : What is the name of test of single phase transformer?

A : Short circuit test B : Open circuit test C : Polarity test D : Continuity test

20 : What is the connection name of transformer?

A : Star - star B : Star -delta C : Delta - delta D : Delta - star

21 : Which is the name of connection?

A : Star - delta B : Delta - delta C : Scott connection D : Star - star

22 : Which test of transformer oil is illustrated?

A : Field test of insulating oil B : Dielectric test C : Crackle test D : Acidity test

23 : Where synthetic liquid transformer oil is used? A : Generating station transformers B : Primary substation transformers C : Refineries and hazardous location D : Secondary substation transformers

24 : Which part produces magnetic flux in a transformer? A : Primary winding B : Secondary winding C : Tap charger D : Core

25 : Which is the function of breather in transformer? A : Observes heat B : Indicate oil level C : Prevents the moisture entry D : Reduces tank pressure

26 : Why the transformer core is laminated? A : To minimise the hysteresis losses B : To minimise the eddy current loss C : To minimise the copper loss D : To minimise the friction loss


27 : Why shell type core is used for medium and high voltage transformers? A : To avoid leakage of flux B : To reduce the tank size C : For effective cooling D : To reduce copper loss

28 : Which type of transformer is used in automobiles? A : Instrument transformer B : Ignition transtor C : Scott connected transformer D : Isolation transformer

29 : Which transformer is classified based on the shape of core? A : Air core transformer B : Shell type transformer C : Audio frequency transformer D : Instrument transformer

30 : Which is the application of ring type transformer? A : High frequency measurement B : High current measurement C : Low frequency measurement D : Power distribution

31 : How the capacity of transformers are rated? A : KW B : KVA C : KWH D : MW

32 : Which part of transformer is used to compensate the voltage drop to consumer receiving from generating station? A : Iron core B : Secondary winding C : Primary winding D : Tap changer

33 : Which condition the efficiency of a transformer is maximum? A : Copper is loss is less than iron loss B : Copper loss = iron loss C : Copper loss is more than iron loss D : Copper loss is 1/2 times of iron loss

34 : Which loss is a variable loss? A : Copper loss

B : Iron loss C : Friction loss D : Windage loss

35 : Which loss is determined by conducting short circuit test? A : Friction loss B : Windage loss C : Iron loss D : Copper loss

36 : Which loss is constant for no load and all load conditions? A : Windage loss B : Iron loss C : Copper loss D : Friction loss

37 : Which is the purpose of bushings in transformer? A : To connect primary terminals only B : To connect both input and output terminas C : To connect secondary terminals only D : To connect the neutral terminals

38 : Which type of test is known as DGA test in transformer bushing testing? A : Measurement of partial discharge B : Moisture analysis C : Dielectric gas analysis D : Dissolved gas analysis

39 : Which is the advatage of auto transformer over two winding transformer? A : Can isolate the secondary from primary B : Better voltage regulation C : Used for power distribution D : Can be used in EHT supply

40 : Which is the application of auto transformer? A : Servo line correctors B : For low voltage distribution C : To measure the voltage D : To measure the current


41 : Which is the purpose of parallel operation of transformers? A : To reduce the voltage drop B : To increase the output voltage C : To reduce the no of transformer D : Provides more reliability of power

42 : Which condition is to be satisfied before connecting two single phase transformer in parallel? A : Phase sequence must be same B : Type must be same C : Polarity must be same D : Capacity must be same

43 : Which is the application of scott connection? A : Transform 3 phase to 2 phase B : To stabilize the output voltage C : To get rated power output D : Transform 3 phase to 6 phase

44 : Which type of cooling is employed for distribution transformer upto 100 KVA? A : Natural air method B : Oil blast method C : Air blast method D : Forced circulation of oil

45 : Which is the purpose of cooling of transformer? A : To improve the efficiency B : To protect the winding from damage C : To regulate the voltage D : To increase the life of transformer oil

46 : Which method of cooling the fans are used to blow air on the surface of transformer? A : Forced oil and water cooled B : Air blast method C : Oil and water cooled method D : Oil blast method

47 : Which is the cause for deterioration of transformer oil? A : Due to over load B : Insufficient cooling C : Long time use D : Due to atmosphere air come into contact with oil


48 : Which is conventional power generation? A : Thermal B : Solar C : Biogas D : Wind energy

49 : Which fuel is used to generate heat energy in thermal power station? A : Coal B : Wood C : Biogas D : Kerosene

50 : Which is the name of part marked as x of hydro electric plant?

A : Surge tank B : Valve house C : Penstock D : Reservoir

51 : Which is the name of part marked as x?

A : Nozzle B : Pelton wheel C : Operating head D : Spear

52 : Which is the name of power station?

A : Hydro power station B : Thermal power station C : Nuclear power station D : Diesel power station

53 : What is the name of part that increases the pressure of air supplied to engine to increase power in diesel power plant? A : Governing system B : Cooling system C : Fuel system D : Super charger

54 : Which device further raises the temperature of steam in thermal power station? A : Boiler B : Super heater C : Economiser D : Air preheater

55 : What is full form of PWR in nuclear power plants? A : Pressurized water reactor B : Pressurized water resource C : Pressurized water restore D : Pressurized water receiver

56 : Which material is used to made moderator in nuclear reactor? A : Graphite B : Uranium C : Nickel D : Copper


57 : How sun heat energy is converted into electrical energy? A : By solar cells B : By reflecting the sunlight C : Thermo couple method D : By radiation method

58 : Which converts rotor rotation into high speed and rotate the electrical generator in wind power generation? A : Turbine controller B : ISU grid C : Gear box D : Chopper

59 : Which is the voltage range of secondary distribution? A : 66KV B : 33KV C : 11KV D : 415V

60 : Which type of transmission is adopted for AC power transmission? A : Single phase two wire B : Two phase three wire C : Three phase three wire D : Three phase four wire

61 : What is the name of conductor used in over head lines? A : ACSR B : Iron C : Brass D : Copper

62 : Which is the important property of OH line supports? A : High mechanical strength B : Withstand Heavy weight C : High conductivity D : Low specific gravity

63 : Which is the span length of steel tower? A : 40-50 meter B : 50-80 meter C : 60-100 meter D : 100-300 meter

64 : Which height the stay insulators are to be fixed? A : Not below 1 m from ground

B : Not below 1.5 m from ground C : Not below 2 m from ground D : Not below 3 meters from ground

65 : Which is the name of insulator?

A : Suspension insulator B : Stay insulator C : Shackle insulator D : Post insulator

66 : Which is the name of insulator?

A : Pin insulator B : Stay insulator C : Shackle insulator D : Disc insulator

67 : Which is the clearance between live conductors in OH.LT. vertical configuration? A : 20 cm B : 30 cm C : 40 cm D : 50 cm


68 : What is the purpose of applying grease in binded aluminium joints in OH lines? A : Avoid sparking B : Avoid oxidation C : Avoid loose connection D : Fill the gap between turns

69 : What is minimum clearance between earth and live conductor in LT vertical configuration? A : 10 cm B : 15 cm C : 25 cm D : 30 cm

70 : Which is the conductivity of aluminium compared to copper? A : 30% B : 40% C : 50% D : 60%

71 : Which is the height of bus-bar assembly to be installed from ground? A : 1 m B : 1.5 m C : 2 m D : 2.75 m

72 : What is the name of material used for bus bar? A : Brass B : High speed steel C : Bronze D : Aluminium

73 : Which is non conventional power generation? A : Wind B : Nuclear C : Thermal D : Hydro

74 : Which is the suitable place for construction of hydro power plant? A : Hill area B : Seashore C : Islands D : Deserts

75 : Which is the main disadvantage of hydro power plant? A : High capital cost

B : Complicated construction C : High maintenance cost D : Requires long starting time

76 : Which is the advantage of diesel power plant over thermal plant? A : More efficient B : Less noise C : Low maintenance cost D : High unit capacity

77 : Which device heats the feed water on its way to boiler by deriving heat from the flue gases in thermal power plant? A : Super heater B : Economiser C : Air preheater D : Condenser

78 : Which part convert potential energy into kinetic energy in tidal power plant? A : Sluices B : Embankments C : Turbines D : Barrage

79 : Which is the disadvantage of AC electric power transmission? A : Skin effect B : More voltage fluctuation C : Required transformer for voltage step up/down D : More line loss

80 : Which is the advantage of DC electric power transmission? A : Required only two conductors B : No communication problem due to high voltae C : No need of transformer D : High voltage transmission

81 : Which is the voltage range transmitted to load center in primary transmission? A : 11KV B : 33KV C : 66KV D : 132KV


82 : Which is the voltage range transmitted in secondary transmission system? A : 11 KV B : 11.5 KV C : 12 KV D : 66 KV

83 : Which is the property of conducting materials used for OH lines? A : High tensile strength B : High specific gravity C : High dielectric strength D : Easy available in the market

84 : How many disc of suspension insulators are to be connected in series for a 66KV working voltage? A : 2 B : 3 C : 4 D : 6

85 : Which insulator is used for terminating corner poles? A : Pin insulator B : Shackle insulators C : Stay insulator D : Cap and pin type insulator

86 : Which is the size of binding wires used to bind insulator in OH lines? A : Not less than 1sq.mm B : Not less than 1.5sq.mm C : Not less than 2sq .mm D : Not less than 2.5sq.mm

87 : Which is the minimum clearance between live wires on either side of a support in OH horizontal configuration of conductors? A : 10 cm B : 25 cm C : 30 cm D : 45 cm

Wireman – Semester 4 Module 3 - Distribution and protection Reviewed and updated on: 01st November 2019 Version 1.1

88 : Which distribution system is used for domestic light and appliances? A : Single phase two wire B : Three phase three wire C : Two phase Two wire D : Single Phase one wire

89 : What is a interconnected distribution system? A : Distributor gets supply from one source B : Distributor gets supply from two locations C : Distributor gets supply direct from substation D : Distributor gets supply from more than two locations

90 : What is service main? A : The cable carrying supply from distributor to meter of consumer B : The cable carrying supply from meter to load C : The cable carrying supply from generating station to transformer D : The cable carrying supply from transformer to over head line

91 : What is feeder? A : The line carrying supply from generating station to distributors B : The cable carrying supply from transformer to over head lines C : The cable carrying supply from meter to load D : The cable carrying supply from distributor to meter of consumer

92 : What is distributor? A : The conductors providing supply to transmission lines. B : The conductors providing supply to distribution line C : The conductors providing supply to service main D : The conductors providing supply to a power transformer

93 : Where steel towers are used? A : Transmission lines B : Primary distribution lines C : Secondary distribution lines D : For telephone lines

94 : Which is used to carry higher voltage for long distance transmission?

A : Feeder B : Distributor C : Service main D : Service wire

95 : Which conductor is used in over head lines? A : Copper conductor B : Aluminium Conductor C : ACSR Conductor D : Steel Conductor

96 : What is distribution system? A : Supply from substation to consumer B : Supply from generating station to substation C : Generation of power in a generating station. D : Supply from generating station to transmission line

97 : How the size of feeder is decided? A : On the basis of line voltage B : On the Basis of current of the line C : On the basis of length of line D : On the basis of height of line

98 : Where underground distribution system is preferred? A : Open areas B : In forests C : Highly populated area D : Hill areas

99 : What is the advantage of underground distribution system? A : High installation cost B : Difficult to trace the faults C : Lower life span D : Good appearance

100 : Which is a part of over head line? A : Lead sheath B : Stay wire C : Armouring D : Cable trench

101 : Which is a line protecting device? A : Bus bar B : Isolating switch C : Insulator D : Circuit Breaker

Wireman – Semester 4 Module 3 - Distribution and protection Reviewed and updated on: 01st November 2019 Version 1.1

102 : Which type of isolater consists of four arms and at the end of arm silver plated copper contacts are fixed? A : Single brake isolater B : Double brake isolater C : Pantograph isolater D : Bus side isolater

103 : Which motor is fitted with single phasing relay? A : Single Phase motors B : DC shunt motor C : DC series motor D : Three phase motors

104 : Which is the name of relay used to protect turbo generators from internal fault? A : Earth fault relay B : Inverse time relay C : Under voltage relay D : Differential relay

105 : Which type of distribution is used in residential area? A : Single phase two wire B : Three phase three wire C : Two phase Two wire D : Three phase four wire

106 : Which distribution system is energised by more than two generating station? A : Radial system B : Ring main system C : Inter connected system D : DC system

107 : Which supply can provide supply for 3 phase as well as single phase load? A : Single phase two wire B : Two phase two wire C : Three phase three wire D : Three phase four wire

Wireman – Semester 4 Module 4 - Substation and equipment Reviewed and updated on: 01st November 2019 Version 1.1

108 : Which is a circuit breaker? A : Power factor improvement device B : Protect from under voltage C : Controlling device D : Protect from over voltage

109 : Which is the full form of VCB? A : Variable circuit breaker B : Voltage control breaker C : Vacuum circuit breaker D : Vacuum control breaker

110 : Which condition circuit breaker operates? A : Low current B : Over current C : Under voltage D : Over voltage

111 : Which material is used for insulating of outer body of vacuum circuit breaker? A : Glass or ceramic B : Iron C : Stainless steel D : Ebonite

112 : Which circuit breaker is used in rural area? A : OCB B : SF6 C : vacuum circuit breaker D : ACB

113 : Which is circuit breaker is best suited for capacitor bank switching? A : Vacuum circuit breaker B : air blast circuit breaker C : SF6 D : Oil circuit breaker

114 : Which part of the circuit breaker is helpful in breaking the circuit? A : Trip coil B : Operating rod C : Supporting champer D : Circuit breaking champer

115 : What is the full form of ACB? A : Automatic circuit breaker B : Acutal circuit breaker C : Alloy circuit breaker D : Air circuit breaker

116 : What is the medium of arc quenching in an air circuit breaker? A : Oil B : water C : Nitrogen D : Air

117 : How circuit breakers arc rated? A : Ampere B : Voltage C : Megawatt D : MVA

118 : Which type of transformer, the current transformer comes under? A : Idel transformer B : Step down transformer C : Step up transformer D : Instrument transformer

119 : What is the secondary voltage of PT? A : 440 V B : 11000 V C : 660 V D : 110 V

120 : What current the secondary of a CT is designed? A : 2 Amp B : 3 Amp C : 4 Amp D : 5 Amp

121 : What action is required before disconnecting the ammeter connected with CT? A : Remove the earth of CT B : short the secondary of CT C : Opened the secondary side of CT D : Switch OFF total supply

122 : Which is the use of lighting arrester in HT line? A : Protect the transformers from surge B : For short circuit protection C : For open circuit protection D : For leakage protection


123 : What is the name of device used for protection against lightning in over head line? A : Air circuit breaker B : Oil circuit breaker C : Lightning arrester D : Isolator

124 : Which is the function of a lightning arrester? A : Protection from over current B : Protection from leakage current C : Protection from lower current D : Protection from over voltage due to lightning

125 : Which gas is used as insulator in circuit breaker? A : Nitrogen B : Oxygen C : Hydrogen D : SF6

126 : Which circuit breaker has the lowest voltage range? A : Air-break circuit breaker B : Oil circuit breaker C : Vacuum circuit breaker D : SF6 circuit breaker

127 : Which is the purpose of circuit breaker? A : To monitor over voltage B : Protection and control C : Protection and monitor heat D : Monitor under voltage

128 : Which is a part of oil circuit breaker? A : Insulating vessel B : Arc shield C : Arc splitters D : Moving Contact

129 : What is the main purpose of oil in oil circuit breaker? A : Provide insulation B : Quenching arc C : Providing cooling for contacts D : Act as lubrication

130 : What is the full name of SF6 circuit breaker? A : Soda flouride circuit breaker B : Sulphur hexaflouride circuit breaker

C : Sodium flouride circuit breaker D : Sodium bicarbonate circuit breaker

131 : What is the medium of arc quenching in an oil circuit breaker ? A : Oil B : Water C : Nitrogen D : Air

132 : Why aluminium is used as busbar material? A : Low density B : Low cost C : Easy to fabrication D : Low resistance

133 : Which metal is used as contacts in substation switches? A : Brass B : Copper C : Silver D : Tungsten

134 : What is indoor sub-station? A : Sub-station constructed outside the building B : Sub-station constructed inside the building C : Pole mounted sub-station D : The substation laid under ground

135 : Which material is used for making bus bars in indoor substation? A : Silver B : Steel C : Copper D : Gold

136 : What is the purpose of Indoor sub-station? A : To step up voltage B : To step down the voltage C : To increase the power of transformer D : To regulate the voltage

137 : How many types of outdoor sub-station? A : One B : Two C : Three D : Four


138 : How the busbar is rated? A : Voltage B : Current and voltage C : Watt D : KVA

139 : Why stones are provided in sub-stations? A : To avoid the growing of plants and for insulation B : To support the poles C : To support the transformers D : To avoid slippery

140 : How many types of outdoor sub-station? A : One B : Two C : Three D : Four

141 : What is function of outdoor sub-station? A : Change AC supply into DC supply B : Change DC supply into AC supply C : High voltage supply step down into low voltage supply D : Low voltage is stepped up into high voltage

142 : Which of those circuit breaker is sufficient for extra high tension line? A : Air blast circuit breaker B : SF6 circuit breaker C : Minimum oil circuit breaker D : Bulk oil circuit breaker

143 : How many poles used in pole mounted outdoor sub-station? A : Three B : Six C : Two D : Eight

144 : Which system pole mounted substations are used? A : Primary distribution B : Secondary distribution C : Primary transmission D : Secondary transmission

145 : Which is the name of substation used to change the supply frequency? A : Converting substation B : Switching substation

C : Secondary substation D : Stepup substation

Wireman – Semester 4 Module 5 - UG CABLE Reviewed and updated on: 01st November 2019 Version 1.1

146 : Which is the outer layer of an under ground cable? A : Armour B : Lead sheath C : Serving D : Bedding

147 : Which material is used for metallic sheathing in underground cable? A : Copper B : Aluminium C : Nichrome D : Lead

148 : Which material is used for armouring of underground cable? A : Galvanised steel B : Copper C : Cast iron D : CRGO steel

149 : Which conductor material is used for under ground cable? A : ACSR B : Aluminium C : Steel D : Nichrome

150 : What is the function of armouring in under ground cable? A : To avoid mechanical injury to cable B : To prevent entry of moisture C : To protect the metallic sheath D : To provide flexibility to cable

151 : Why stranded conductors are used in underground cable? A : To provide flexibility B : To reduce conductivity C : To provide mechanical strength D : To reduce the weight

152 : Which is the property of insulating materials used in under ground cable? A : Hygroscopic B : High insulation resistance C : Low mechanical strength D : High conductivity

153 : Which type of insulation is also known as empire type? A : Impregnated paper

B : Varnished cambric C : Polyvinyl Chloride D : Rubber

154 : What is the drawback of rubber insulation used in under ground cable ? A : Absorbs moisture B : Hard C : Low mechanical strength D : High hygroscopic

155 : What is the advantage of Vulcanised Indian Rubber ? A : Safe temperature is high B : Hygroscopic C : Greater mechanical strength D : High conductivity

156 : What is the voltage rating of Super tension cables ? A : up to 1100 V B : up to 11000 V C : 22 kV to 33 kV D : beyond 132 kV

157 : What is the voltage rating of Extra super voltage cables ? A : beyond 132 kV B : up to 11000 V C : 22 kV to 33 kV D : up to 1100 V

158 : Which is the classification of underground cable according to their insulation system? A : Single core cable B : XLPE cable C : Low tension cable D : Super tension cable

159 : What is the full form of MI cables ? A : Metal Insulated cables B : Mineral Insulated cables C : Mineral Inserted cables D : Metal Inserted cables

160 : How many cores are in a three and half core under ground cable ? A : Three B : Four C : Two D : Five


161 : Which type of cable is used if the operating voltage is greater than 66 KV ? A : Belted cables B : Screened cables C : H type cable D : Pressure cables

162 : Which are the types of pressure cables ? A : Oil filled and gas pressure cables B : Belted cables and screened cables C : H type and SL type cables D : H type and belted cables

163 : Which method of laying involves digging a trench in the ground and laying cable on a bedding of sand ? A : Laying in ducts B : Laying direct in ground C : Laying on racks D : Solid system of laying

164 : Which method of cable laying is used inside buildings and industrial plants? A : Direct laying in ground B : Laying in ducts C : Laying on racks in air D : solid system of laying

165 : What is the name of the cable laying method?

A : Laying into ducts B : Laying direct in ground C : Laying along building D : Laying on racks in air

166 : What is the advantage of direct laying of underground cable ?

A : Simple and less costly B : Easy extension of load C : Alteration is easy D : Easy fault location

167 : Which method of cable laying, The cable in protected by sand (or) layer of bricks? A : Laying cables along building B : Laying cables direct in grounds C : Laying cables into ducts D : Laying cables on racks in air

168 : What is the full form of PILC? A : Paper impregrated lead sheathed cable B : Paper insulated lead sheathed cables C : Paper input lead sheathed cable D : Polyvinyl impregrated lead sheathed cable

169 : What is the name of the U.G. cable joint?

A : Tee joint B : Straight through sleeve joint C : Epoxy straight joint D : Tri-furcating end connection

170 : What is maximum voltage grade of U.G. cable straight sleeve joints can be made? A : Up to 1.1 KV B : Up to 3.3 KV C : Up to 11.0 KV D : Above 11 KV

171 : What is the use of Tri- furcating end connections? A : To connect UG cables to AB switches etc. B : To make straight through joints of UG cable C : To make Tee joint of UG cable D : To test the UG cable

172 : Which is the property of bituminous compound used for hot pouring cable joint? A : Low electrical strength B : High electrical strength C : High resistance to moisture D : Low viscosity


173 : Which is the common fault likely to occur in under ground cable? A : Open circuit fault B : Ground fault C : Short circuit D : Leakage fault

174 : Which test is used for locating ground and short circuit fault in UG cable? A : Open circuit test B : Short circuit test C : Loop test D : Ground test

175 : Which type of cable fault will occur, If the insulation between two conductors is faulty? A : Ground fault B : Open circuit fault C : Short circuit fault D : Leakage current fault

176 : Which cable fault is caused due to the flow of current from the core to the lead sheath? A : Ground fault B : Short circuit fault C : Leakage current fault D : Open circuit fault

Wireman – Semester 4 Module 6 - SYNCHRONISING OF ALTERNATOR Reviewed and updated on: 01st November 2019 Version 1.1

177 : What is the necessity of syncronising of alternators? A : To increase the voltage B : To increase the voltage C : To meet the increased power demand D : Top minimise the current

178 : Which is the condition for paralleling of two alternators? A : Frequency must be same B : Frequency must be same C : Rating must be same D : Phase sequence must be different

179 : What is the condition of incoming alternators voltages for synchronising of alternators? A : Out put voltage of alternators must be different B : Out put voltage of alternators must be different C : Voltage of incoming alternator must be more D : Incoming voltage of alternator must be less

180 : When the three lamps used in dark lamp method will light and go out simultaneously? A : Frequencies of machines are different B : Frequencies of machines are different C : Speed of alternators are same D : Out put voltage of alternators are same

181 : What is the use of dark and bright lamp method? A : To start the alternator B : To start the alternator C : For synchronising of alternators D : To change the excitation

182 : Which instrument is used for parallel operation of alternators? A : Synchroscope B : Synchroscope C : Phase sequence meter D : Centre zero ammeter

183 : What is the purpose of synchroscope for synchronising of alternators? A : To check the voltages B : To check the voltages C : Indicate the difference in voltage and phase sequence D : To indicate the exact time for synchronising

184 : What basis the load is shared by the two alternators after synchronised? A : Sharing the load equally irrespective of KVA ratings B : Sharing the load equally irrespective of KVA ratings C : Based on the proportion of their KVA ratings D : Sharing the load according to their voltage ratings

Wireman – Semester 4 Module 7 - Control panel wiring and maintenance Reviewed and updated on: 01st November 2019 Version 1.1

185 : Which colour is to be powder coated (painted) on a control panel as per IE rule? A : Light blue B : Siemens Gray C : Yellow D : Dark blue

186 : Which electrical items are to be fitted in a control panel? A : Switches and indicators only B : Bus bar only C : Safety equipments ony D : Switching, control, safety and measuring devices

187 : Which duty cycle of contactor used for the application of Crane,Lift,and hoist in AC? A : AC 2 B : AC 4 C : DC 1 D : DC 2

188 : Which factor is to be considered while designing the control panel dimensions? A : Height of panel B : Width of panel C : Length of panel D : Swing area of cabinet doors

189 : Which is the amount of additional load to be considered before selecting the protective accessories for a motor in control panel? A : 25% B : 50% C : 75% D : 100%

190 : What is the name of switch?

A : Change over switch B : Pole changing switch C : Ammeter selector switch D : Voltmeter selector switch

191 : What type of switch unsuitable for portable (or) mobile devices? A : Push button switch B : Pole changing switch C : Mercury switch D : Limit switch

192 : which is used with ammeter to measure high current in panel board? A : Current Transformer B : Control Transformer C : Potential Transformer D : Power Transformer

193 : Which switch is used to control the distance or angles of movement of any machine part or axis or object? A : Mercury switch B : Limit switch C : Push button switch D : Selector switch

194 : What is the name of accessory used in control panel?

A : Indication Lamp B : Timer C : Rectifier D : Push button switch

195 : Which accessory is used in control panel to mount MCB,Contactor etc.without using screw? A : Race way B : DIN rail C : Gromet D : PVC channel


196 : What is the use of wire ferrule in control panel wiring? A : Harnessing the cable B : Insulating the cable C : Easy identification of cable end D : To protect the wire from heat

197 : What is the name of part marked as X in nylone cable tie?

A : Button B : Head C : Thimble D : Pawl

198 : Which accessory is used to insulate and hold the cables, if they pass through punched or drilled hole in control panel? A : Grommet B : PVC channel C : Wire clips D : Wire sleeves

199 : Which is the minimum spacing between components and raceways in panel board if system voltage is 415V? A : 50 mm B : 100mm C : 60 mm D : 75 mm

200 : Which colour of earth wire is used in control panel to earth door and cabinet? A : Red B : Yellow C : Blue D : Green yellow

201 : Which test is to be done regularly in panel board with priority? A : Main power contacts condition

B : Insulation resistance and earth continuity C : MCB connection D : Filter and cooling fan

202 : Which is the advantage of periodical maintenance of control panel? A : Reduces power cost B : Assured over loading C : Ensure safety to the machine and operators D : Helps continuos operation

203 : Which type of fault will occur if the insulation of cable is damaged? A : Earth fault B : Open circuit C : Short circuit D : High value series resistance fault

204 : Which is the purpose of third terminal in insulation tester? A : To measure more quantity B : To extend the range C : To use as a earth tester D : To get accurate reading

205 : What is the name of instrument used to find out open circuit fault in control panel? A : Earth tester B : Ohm meter C : Megger D : Wheatstone bridge

206 : Why it is recommended to run power and control circuit cables seperatly in control panel? A : For easy Identification B : To Avoid transfer of heat from power cable to control cable C : To avoid leakage D : To avoid short circuit

207 : What is the name of fault if line is break in power cable? A : Open circuit B : Short circuit C : Earth fault D : Earth leakage


208 : Which is the minimum value of insulation resistance between phase to earth terminal in electrical installation? A : 10 MΩ B : 100 MΩ C : 10 kΩ D : 1 MΩ

209 : Which type of fault light will glow dim and motor runs slowly in a electrical installation? A : Open circuit B : Earth leakage C : High value series resistance fault D : Short circuit

210 : What is the function of Residual Current Circuit Breaker in electrical Installation? A : Protect from short circuit B : Protect from over current C : Protect from open circuit D : Protect from earth leakage

211 : Which helps the maintenance electrician to trouble shoot a fault in control panel in absence of operation manual? A : Trouble shooting flow chart B : Maintenance schedule C : Machine register D : Machine maintenance card

Wireman – Semester 4 Module 8 - Estimation and costing of wiring Reviewed and updated on: 01st November 2019 Version 1.1

212 : Which is the full form of NE code? A : National Energy Code B : National Engineering Code C : National Electricity Code D : National employment Code

213 : Which is the name for calculating the cost of material and labour of electrical installation? A : Estimation B : Layout C : Schedule D : Specifications of materials

214 : How many power socket outlet are permitted in a power sub circuit as per IE rule? A : 1 B : 2 C : 3 D : 4

215 : Which term defines that the ratio between minimum actual load to Installed load? A : Depreciation Factor B : Demand Factor C : Diminishing Factor D : Diversity Factor

216 : Which is the number of light and fan points recommended in a sub circuit as per IE rule in domestic wiring? A : 12 B : 10 C : 8 D : 6

217 : How much percentage of total cost is added to estimate as contingencies? A : 20% B : 15% C : 10% D : 5%

218 : Which is the recommended power for a lighting sub circuit as per IE rule in domestic wiring? A : 800W B : 1200W C : 2000W D : 3000W

219 : What is the height of horizontal run of cables as per IE code recommendation? A : 2.5m

B : 3m C : 2m D : 1.5m

220 : Which is the location of distribution board in a domestic wiring installation? A : Near to main door B : Under stair case C : Near to load center D : In Portico

221 : Which is the size of G.I earth conductor to be connected in third terminal of wall sockets as per IE rule? A : NO.16 SWG B : NO.14 SWG C : NO.10 SWG D : NO.8 SWG

222 : Which connections the flexible cords is to be used? A : Recessed conduit wiring B : Pendant lamp C : Air conditioner D : Electric Iron

223 : Which is the minimum clearance must be kept between ceiling and plane of blade of a ceiling fan? A : 150mm B : 200mm C : 275mm D : 300mm

224 : Which type of light fitting should be used for outdoor lighting? A : Water proof lighting B : Direct lighting C : Spot light D : Indirect lighting

225 : Which type of switch is used,if the appliance rating is higher than 16A? A : 16A single pole switch B : 16A Two way switch C : 6A SP switch D : 32A Double pole switch


226 : Which pump is used to lift water from a deep bore well? A : Reciprocating pump B : Rotary pumps C : Centrifugal pump D : Submersible pump

227 : Which is the cross sectional area of neutral bus bar compared to phase busbar above 200 A capacity? A : Half of phase busbar B : 2 times of phase busbar C : 1.5 times of phase busbar D : Same as phase busbar

228 : Which factor determines the size of wire used for industrial wiring? A : Type of wiring distance B : Distance from source C : Line voltage D : Load current

229 : Which type of the bus bar system is illustrated?

A : Horizontal bus system B : Vertical bus system C : 8 bar system D : Bus bar trunking system

230 : Which is the distance of saddles to be fixed from the centre of bends (or) couplings in metal circuit wiring? A : 60cm B : 50cm C : 30cm D : 15cm

231 : Which is the alpha numberic rotation for apparatus AC 3 phase system? A : A,B,C,N B : X,Y,Z,N C : U,V,W,N D : A,B,C,N

232 : What is the name of distribution system used in industries?

A : Bus bar suspended from roof B : Bus bar supported from ground C : Vertical mounted bus bar D : Bus duct system

233 : Which is the minimum size of copper conductor used for power wiring in commercial wiring as per IE rule? A : 1 mm2 B : 1.5 mm2 C : 2.0 mm2 D : 2.5 mm2


234 : Which is the name of position marked as x?

A : Height B : Horizondal run C : Vertical run D : Down drop

235 : Which is the minimum size of PVC conduit used in government installations prescribed by CPWD? A : 20mm B : 16mm C : 19mm D : 32mm

236 : What is the first step taken during preparation of estimating the material required for any type of wiring installation? A : Take the lay out B : Purchase accessories for testing C : Prepare instruments for testing D : Purchase cables testing

237 : Which load is to be connected from stand by generator set in the event of failure of mains? A : Garden lighting B : Portico lighting C : Fire lift and water pumps D : Playing area lighting

238 : Which is the recommended height of energy meter to be installed from floor level in commercial wiring as per IE rule? A : Not less than 1m B : Not less than 1.5m

C : Not less than 2m D : Not less than 2.5m

239 : Which is to be considered before the selection of conductor, protective devices and switch gear in commercial wiring? A : Diversity factor B : Type of wiring C : Place of wiring D : Climatic conditions

240 : Where the location of main switch in a domestic wiring installation? A : Near to load centre B : Near to termination of service line C : Out side wall of building D : Near main door

241 : Which cable is selected for service connection and outdoor applications? A : PVC insulated PVC sheathed B : PILC cable C : TRS sheathed D : Lead alloy sheathed

242 : Which type of wiring system used in multistoried building? A : Tree system B : Bus bar system C : Ring main system D : Distribution board system

243 : Which is the number of earth leads shall be provided along with vertical runs of rising mains? A : 1 B : 2 C : 3 D : 4


244 : What is the name of distribution system?

A : Ring main system B : Distribution board system C : Rising main system D : Bus champer system

245 : Which is the permissible power load in a sub circuit as per IE rule? A : 800 Watts B : 1200 Watts C : 2400 Watts D : 3000 Watts

246 : What is the formula to calculate the voltage drop in 3 phase circuits ? (If I=line current R=Resistance of one core) A : √3 IR B : I²R C : IR D : 3 IR

247 : Which is the permissible voltage drop at the point of consumer on high and extra high voltage as per IE rule? A : 3% B : 5% C : 8.50% D : 12.50%

248 : Which is the height of distribution boards to be fixed from floor level as per IE rule? A : Not more than 1m B : Not less than 1.5m C : Not less than 2m D : Not less than 2.5m

249 : Which type of distribution is used in workshop wiring? A : Raising mains B : Bus chamber C : Tree system D : Ring main system

250 : Which is the thickness of metal conduit pipe for conduit size up to 32 mm as per IE Rule? A : 20 SWG B : 19 SWG C : 32 SWG D : 16 SWG

251 : Which helps both wireman and consumer to select the material according to commercial practice, cost and requirement? A : Drawing B : Specification of material C : Layout D : Estimation

252 : Which is the reason for using bus bar system in workshop for power distribution? A : Occupy less space B : Give neat appearance C : Easy addition and alterations D : Withstand over load

253 : Which method of wiring consumes less quantity of wire/cable? A : Joint box method B : Loop in back method C : Loop in using two plate ceiling rose and switch D : Loop in method using three plate ceiling rose


254 : Which accessory is represented by the BIS symbol?

A : Combined switch and socket outlet 16A B : Interlocking switch and socket 6A C : Interlocking switch and socket 16A D : Socket outlet 16A

255 : Which wire is to be connected through switch as per IE rule? A : Phase line B : Neutral C : Earth D : Ground

ANSWERS :

1:B; 2:B; 3:D; 4:A; 5:C; 6:C; 7:D; 8:D; 9:A; 10:C; 11:C; 12:C; 13:C; 14:A; 15:D; 16:B; 17:B; 18:C; 19:C; 20:B; 21:C; 22:C; 23:C; 24:D; 25:C; 26:B; 27:A; 28:B; 29:B; 30:B; 31:B; 32:D; 33:B; 34:A; 35:D; 36:B; 37:B; 38:D; 39:B; 40:A; 41:D; 42:C; 43:A; 44:A; 45:B; 46:B; 47:D; 48:A; 49:A; 50:B; 51:A; 52:A; 53:D; 54:B; 55:A; 56:A; 57:A; 58:C; 59:D; 60:C; 61:A; 62:A; 63:D; 64:D; 65:C; 66:B; 67:A; 68:A; 69:D; 70:D; 71:D; 72:D; 73:A; 74:A; 75:A; 76:A; 77:B; 78:C; 79:A; 80:A; 81:D; 82:D; 83:A; 84:D; 85:B; 86:C; 87:D; 88:A; 89:D; 90:A; 91:A; 92:C; 93:A; 94:A; 95:C; 96:A; 97:B; 98:C; 99:D; 100:B; 101:D; 102:C; 103:D; 104:D; 105:D; 106:C; 107:D; 108:C; 109:C; 110:B; 111:A; 112:C; 113:A; 114:A; 115:D; 116:D; 117:D; 118:D; 119:D; 120:D; 121:B; 122:A; 123:C; 124:D; 125:D; 126:A; 127:B; 128:D; 129:B; 130:B; 131:A; 132:B; 133:C; 134:B; 135:B;

136:B; 137:B; 138:B; 139:A; 140:B; 141:C; 142:B; 143:C; 144:B; 145:A; 146:C; 147:D; 148:A; 149:B; 150:A; 151:A; 152:B; 153:B; 154:A; 155:C; 156:C; 157:A; 158:B; 159:B; 160:B; 161:D; 162:A; 163:B; 164:C; 165:A; 166:A; 167:B; 168:B; 169:B; 170:C; 171:A; 172:C; 173:B; 174:C; 175:C; 176:A; 177:C; 178:A; 179:B; 180:A; 181:C; 182:A; 183:D; 184:C; 185:B; 186:D; 187:B; 188:D; 189:A; 190:D; 191:C; 192:A; 193:B; 194:C; 195:B; 196:C; 197:D; 198:A; 199:B; 200:D; 201:B; 202:C; 203:A; 204:D; 205:C; 206:B; 207:A; 208:D; 209:C; 210:D; 211:A; 212:C; 213:A; 214:B; 215:D; 216:B; 217:D; 218:A; 219:A; 220:C; 221:B; 222:B; 223:D; 224:A; 225:D; 226:D; 227:A; 228:D; 229:C; 230:C; 231:C; 232:A; 233:D; 234:D; 235:C; 236:A; 237:C; 238:A; 239:A; 240:B; 241:A; 242:A; 243:B; 244:C; 245:D; 246:; 247:D; 248:C; 249:B; 250:D; 251:B; 252:C; 253:A; 254:D; 255:A;

Wireman Semester 4 Module 2 - Generation and transmission

Documents

Transcript of Wireman Semester 4 Module 2 - Generation and transmission